The Northwest Energy Efficiency Alliance (NEEA) engaged Navigant Consulting, Inc. (Navigant) to undertake an introductory market assessment of a new product initiative: Window Attachments, which includes products installed in commercial and residential markets. This study focuses on secondary glazing systems (SGS), which are commercial single-pane window retrofits installed on the interior side of a building. SGS products improve the performance of existing windows without replacing existing glass, window frames, or altering the exterior appearance of the building. The study’s goal was to conduct initial market research to confirm product performance, barriers, and market information sufficient to inform a preliminary market baseline.1
